/* 第5套 web · 双栏工作室 Swiss split */
:root {
  --bg: #f7f5f2;
  --ink: #141414;
  --muted: #5a5854;
  --line: #d8d4cc;
  --magenta: #c2185b;
  --magenta-deep: #9b1449;
  --rail: #111;
  --paper: #fff;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Arial, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16.5px;
  line-height: 1.75;
}

a { color: var(--magenta); text-decoration: none; }
a:hover { text-decoration: underline; }
svg { display: inline-block; vertical-align: middle; }

.shell {
  display: grid;
  grid-template-columns: 236px 1fr;
  min-height: 100vh;
}
.rail {
  background: var(--rail);
  color: #eee;
  padding: 1.2rem 1rem 2rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin-bottom: 0.45rem;
}
.brand svg { width: 22px; height: 22px; color: var(--magenta); }
.rail p {
  margin: 0 0 1.1rem;
  color: #9a9690;
  font-size: 0.78rem;
}
.nav a {
  display: block;
  padding: 0.55rem 0.65rem;
  color: #ddd;
  border-left: 3px solid transparent;
  margin-bottom: 0.2rem;
}
.nav a:hover { color: #fff; text-decoration: none; background: #1c1c1c; }
.nav a.on {
  border-left-color: var(--magenta);
  color: #fff;
  background: #1c1c1c;
}
.toc { margin-top: 1.4rem; }
.toc b {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: #8d8880;
  margin-bottom: 0.45rem;
}
.toc a {
  display: block;
  color: #bbb;
  font-size: 0.82rem;
  padding: 0.28rem 0;
}

.stage { padding: 1.6rem 2rem 2.4rem; }
.stage h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  letter-spacing: -0.03em;
  line-height: 1.25;
}
.stage h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.28rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--ink);
}

.hero-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.2rem;
}
.note {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1rem 1.05rem;
  border-top: 6px solid var(--magenta);
}
.note h3 { margin: 0 0 0.45rem; font-size: 0.95rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0.3rem 0.4rem 0.3rem 0;
  padding: 0.62rem 1.05rem;
  background: var(--magenta);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
.btn svg { width: 16px; height: 16px; }
.btn:hover { background: var(--magenta-deep); color: #fff; text-decoration: none; }
.btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-ghost:hover { background: #111; color: #fff; }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1rem 1.05rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.02rem; }
.card svg { width: 18px; height: 18px; margin-right: 0.3rem; }

.row5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}
.row5 div {
  background: #fff;
  border: 1px solid var(--line);
  padding: 0.7rem 0.55rem;
  font-size: 0.88rem;
}
.row5 strong { display: block; }

.quotes .q {
  background: #fff;
  padding: 0.9rem 1rem;
  margin-bottom: 0.65rem;
  border-left: 4px solid var(--ink);
}
.q footer { color: var(--muted); font-size: 0.86rem; }

.kpis {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.55rem;
}
.kpis div {
  background: #111;
  color: #fff;
  padding: 0.85rem 0.6rem;
  text-align: center;
}
.kpis b { display: block; color: #ff7aa8; font-size: 1.35rem; }

.tbl {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.tbl th, .tbl td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
}
.tbl th { background: #111; color: #fff; }

.faq article {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.faq h3 { margin: 0 0 0.35rem; font-size: 1rem; }

.site-foot {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 4px solid #111;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-foot .safe { color: var(--magenta); font-weight: 700; }
.foot-nav a { margin-right: 0.9rem; }

.nav-toggle {
  display: none;
  background: #111;
  color: #fff;
  border: 0;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
}
.nav-toggle svg { width: 18px; height: 18px; }

@media (max-width: 920px) {
  .shell { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; }
  .nav { display: none; }
  .nav.open { display: block; }
  .nav-toggle { display: inline-flex; }
  .hero-split, .pair, .row5, .kpis { grid-template-columns: 1fr; }
  .stage { padding: 1.1rem 1rem 2rem; }
}

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }